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Magnetic Coil Companies and Services

IQS Directory provides a comprehensive list of coil winding companies. Use our website to review and source top coil winding companies with roll over ads and detailed product descriptions. Find companies that can engineer coil winding to your companies specifications. Then contact the coil winding companies through our quick and easy request for quote form. Website links, company profile, locations, phone, product videos and product information is provided for each company. Access customer reviews and keep up to date with product news articles.

  • Sag Harbor, NY 800-724-5952

    We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient. We are dedicated to manufacturing the best coils around. Our teams utilize sophisticated to procedures to develop these top notch electrical coils. Give us a call today to learn more information!

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  • Antigo, WI 800-826-9741

    Johnson Electric Coil Company is a family owned manufacturer that specializes in custom transformers, coils and inductors. From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications. Our experienced engineers are available to assist during every step of the process. Let Johnson make great parts for you!

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  • Bristol, CT 860-584-0927

    We are an ISO 9001:2015 certified company which is internationally known for manufacturing high quality electromagnetic-coils. It is our goal to provide quality products, a commitment to speedy delivery, and competitive pricing. We understand that every application is unique, so we encourage you to contact us to discuss your specific requirements. Call us at 1-860-584-0927 and find out what our 50+ years of experience can do for you.

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  • North Manchester, IN 260-982-8508

    At Custom Magnetics, we manufacture transformers and coils, custom designed, for electrical and electronics industries. Our products often serve applications such as audio amplifiers, intercoms, power supplies, transducers, transportation, power generation, etc. Many types of transformers are produced including laminated, toroidal, ferrite cores of all shapes and sizes, and R-Core. Call today!

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  • McAllen, TX 888-664-9495

    Industrial Coils, LLC is a leading manufacturer that specializes in high quality custom solenoid coils wound to customer's specifications From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications. Our experienced engineers are available to assist during every step of the process. Let us make great parts for you!

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  • Marlton, NJ 800-822-9190

    Repco Inc. was founded in 1976. Our name stands for Replacement Electrical Parts Co. The products currently sold by Repco are electrical contacts and coils for industrial control and carbon brushes for industrial motors. The business is located approximately 12 miles east of the city of Philadelphia in Marlton, NJ.

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businessIndustry Information

Coil winding is a process used to produce an electromagnetic field by winding an electric conductor wire in the shape of a coil, spiral, or helix. The structure of the magnetic field, which includes its inductance, resistance, and strength, depends on the design and shape of the coil winding.

The electromagnetic field of a coil winding is created by passing an electric current through the wire of the coil. A varying magnetic field passes through the interior of the coil to generate a current in the conductor.

How the coil is wound determines its efficiency and conductivity. The differing winding processes are designed to serve a certain purpose for the creation of the electromagnetic field. The forms of coil winding are pancake, jumble or wild, toroidal, helical, and orthocyclic. In the winding process, wires should be tightly and densely packed to reduce air flow, or space, in order to increase the efficiency and reliability of the coil as well as the coils heat conductivity.

Jumble, or wild, winding has poor fill factors. Wires are placed randomly, causing a wider distribution of wire lengths and ranges of electric coil resistances. Though this is a disadvantage in coil winding, it is used in mass production because it can be done quickly without the need of operator oversight. Jumble windings are used as relay coils, for small transformers, ignition coils, and small electric motors using small wire gauges of 0.05 mm or less.

Orthocyclic winding has an optimal fill factor for round wires. The upper layers of wires are placed in the grooves of the lower layers. The greatest volume is achieved by winding the wires parallel to the coil flange. Winding goes around the coil body to meet the previous wire and make a step with the size of the wire gauge, which is called a winding step. The area of the step depends on the gauge of the wire and the coil bobbin geometry.

Toroid windings are used with low frequency electricity. A toroid is used as an inductor to boost the frequency. As the toroid turns, it increases the frequency. Toroids are produced by winding copper wire through a circular ring, which is evenly distributed over the circumference of the ring. The benefits of toroid windings are low core loss with power density.

Several types of windings are referred to as pancake because of the conductors being arranged as discs. The term actually refers to a type of coil that is in shell form transformers. In pancake windings, conductor wires are wound in a rectangular pattern with their wide face horizontal or vertical. It is a winding that is used for interleave arrangements.

Helical winding is cylindrical and leaves a gap between adjacent turns. The winding consists of flat parallel rectangular conductors that are close to each other in the radial direction of the winding. Uniform distribution of current between the parallel branches is created by transpositioning of the conductors.